Projecting apparatus.



S.' J. JAGOBSON.

PROJBGTING APPARATUS.

`AP2L10ATIQN FILED 00T. 14, 1909.

Patent-,ed Ju1y4, 1911'.

l II', 'I

Illlll llll Witnesses nnirnn srarns ATENT BEIGE,

To all whom it may concern:

Be it known'that I, SYDNEY J. JAoosoN, a citizen of the United States, and resident of Washington, in the District of Columbia, have invented certain new and usefui Improvements in 'Projecting Apparatus, of which the following is a specification.

Thisinvention relates to a projecting apparatus in whichv 'the light generated by suitable illuminating means is projected upon a surface external to the apparatus. In apparatus of the type referred to the light is usually generated between a set of electrodes. The electrodes burn off however and therefore must be adjusted so as to compensate for this. The electrodes also burn unevenly and both of the above mentioned occurrences require careful attention where the light must be vconstant and unvarying. For this purpose it has been the previous practice to provide the door of one of the walls of the lamp house or casing with a window through which the arc may be observed. Since the i scope, his attention is generally 1 light given -by the arc, however, is very intense it is very` injurious to theeyes. A colored glass is usually placed in the window, but this necessarily renders the observance faulty and often does not cut down the intense light from the crate-r ofthe arc. The above noted method of observation, besides having the disadvantages noted, is very inconvenient, due to the fact that the operators hands and attention are necessarily otherwise occupied with the proper attention to the apparatus. lVhere, for instance, the apparatus is a stereopticon or kinetot-'aken up with the manipulation-0f the s des or the film. Also, where the apparatus is a stage light, the light-and arc are generally placed higher than the operator, and thus the arcacannotbe'observed conveniently. Y It is necessary, however, in all the above mentioned cases thatthe light be constant and uninterrupted during the time that the light is projected.v A p The object of this invention therefore is provide an 'arrangement by means of itivfhich the illuminating means or arc may ,be easily and conveniently observed. p

The invention generally stated, consists in 4by an arc formed ing has formed Patented July 4, 1911. Serial No. 522,670.

an arrangement ywhereby an image or a picture of the arc and electrodes is proj eoted on a screen outside of the lamp house or casing. This screen -may be the wall of the building or a screen attached tothelamp support or casing. By means of this arrangementthe condition of the arc and the electrodes may be readily observed leaving the hands of the'operator entirely free, and hiswhole attention ma be taken up in the proper manipulation o the apparatus.

In the drawing the figure is a perspective view of 'a projecting apparatus showing this invention applied thereto.

Referring to the drawing, 10 designates a support upon which is adjust-ablymounted a lamp house or'casing mounted in this casing and receives a car-` rierl for the electrodes. A pair of electrode clamps 14 support the electrodes 15 which form an arc in the casing. A handle 16 projecting through the casing regulates the. relative position of the electrodes, and

the handle 17 is arranged to regulate theposition of the carrier in the casing. A suitable projecting device 18 is provided, by means of which the vlight from the arc may be projected upon an' external surface or upon the film or slide which is to be thrown on the screen.

therein an aperture 19 located opposite the arc formed between the electrodes'. A support '20 is suitably secured to one of the walls of the casing by screws or the like, and has formed thereon or securedl thereto a hollow shank 21`which receives a carrier 22 supporting a lens 23. This carrier is adapted tobeadjusted toward and from thecasing and clamped in adjusted. position by means` of a set screw 22. A screen 24 is'mounted-upon a .suitable carrier whichcomprises a rod 25 slidin in a hollow sleeve 26, which slides in the iol'- low shank 21. f By means ofthis const-ruc- One of the walls of the casi 11. yA support l2 is A tion the distances between the screen and the lens and the casing may be adjusted.

The operation of this arrangement lwill be obvious from the drawing.' The arc and the electrodes will be projected onthe screen Aby the lens 23 forming an image 15, 15.

By. 'means of the adjustable mounting ofthe lens carrier and the screen carrier the proper` adjustmentfmay be. obtained, so that an image magnified to any suitable degree may be obtained, and thisimage can bemade as clear as desired by properly focusing the 5 lens.v

It is obvious that the screen 24 may be dispensed with and the image of `the are and electrodes may be thrown on v,one of the walls of the building or any other suitable screen set up for that purpose.- v Theimage wlllbe Ireversed', but tlus may be righted by using an additional lens for reversingthe reversed image. The operation i thisl -additional lens will be obvious to'any one skilled in the art.

Theimage thrown on' the screen will, at a-ll times indicate the condition of the arc, especially since this image may be very much magnified by properly positioning e lens carrier.4 The operator may therefore lat any time observe the condition of the electrodes andthe arc' formed, and ,his attention .is

therefore entirely left to the .proper manipu lationofthe projectingl apparatus; lThe-po:- 25 sition of the electrodes and arc asaf-wh'ole in -the casing may also be .observedby image on the screen, sincean identlicat-ion mark may be made'on the screen locating the proper position of the arc, and therefore yv the proper adjustment may be Vreadilly'obtained b moving the electrodes unt' t'iication mark.

Although this'invention is` shown as. ap-

85 plied to one form 'of projecting apparatus, 1t 1s obvlous that 1t 1s not limite to this form.4 The invention may--beused in any 'projecting .a paratus where the -electrodes are used to orm an arc for the purposeof '.40 throwing the light thereof 'on an external surface directly, or throwing .an .image of a gure pn the screen, or illuminating a ii ure to be projected on the screen by ad-l ditional means. In this particular instance the support-20 is shown as-.se'cured to' the casing. Itis/obvious however that this sup portmay be secured to Vthe support or base 10 or an other suitable support as the floor' of the u ilding. The lens may also be mounted in the casingrwall, that 1s,- directly in the aperture l`9. It is 'advantageous however to mount this lens on the outside" of the'l aratus, the vcombinaa `set of electrodes 05 'thereinarrangedte form an are, regulating the image o the arc coincides withthis'piden-' iI means for 'proj ectm meansfor thejelectrodes, means forprojecting the light from said arc,and"means for projecting animage .of said are and electrodes on a screen, for the purposeset'forth.

2. In a projecting apparatuathe combination with a. casing, o

ed with lan vaperture opposite the arc, and a lens line with the aperture and arc arranged to project arrimage of saidarc and electrodes" on a screen, forAv the purpose set forth.; f

` 3.- In a projecting ap aratus, the combination with easing, o a set of electrodes a set ofv electrodes therein'arranged to form' an -ar :,zregulating means for the electrodes, means for projectl Iing-the li ht from said" arc, said'casing be.- ing A'provid therein ,arranged to form an arc, regulating mearislfor sa'i electrodes, means for projecting the light from said arc, a lens arranged to roj'ect an' image-of said arc and electro es on a screen, and a support for said lens secured to said casing,'for the purpose fsetiforth. f i

4.- In a projecting apparatus, theeombination `with a casing, lof a set of electrodes. therein arranged to form an are, regulating *means for said electrodes, means for project .ing the light 4from said arc,a lens arranged tol project an' image. of said 4arc ,and elec- '.trodes 'on a screen, a support-for said lens secured tothe casmg, and means for regulatg 'ing the position of said lens',.for the purpose setforth. i,

'5.-- In a' projecting apparatus, the combination with a support and casing,- of a set of electrodes therein arranged: to form an are, means tor regulating-said electrodes,

arc,- a s'creenmounte on said support, and

ymeans for projecting an-image of said arc and'electrodes onsaid screen, for the pur lpose set forth'.

electrodestherein arranged to form,l an arc, 4means vfor regulating said electrodes, means for -projecting the ight from Vsaid arc, a

the light from said` ecting apparatus,- the combi-v Vnation with asupp'ort and casing, of -a set of screenmounted on said support, a lens` for Y projecting an' image 'of said arc and elecftrodeson said screen, and a' carrier for said lensmounted on said support.

7. In' a projectlng apparatus,the combination with a support'and casing, of a set of 'electrodes therein'arranged to form an arc,

means for regulatinosaid electrodes, means for projecting the IightV from said arc, a screen, a screen carrier mounted on said support, a lens'for projecting an image of said arc and electrodes on `said screen, a carrier for sald lens mounted on .said support, and

means'whereby 'the position of one of said carriers maybe adjusted.

.8. In' a projecting apparatus, the combination. with a casing, of a set of electrodes thereinarranged to forman arc, regulating means for said electrodes, means for projecting the light from said arc', a lens ar-A ranged to project animage of said arc and electrodes on a screen, a bar securedto said casingyand a support for said lens adjustable on said bar, for the purpose setforth.

9. In a projecting apparatus, the combination with a casing', of a set of electrodes therein arranged to form an arc, regulating means for said electrodes, jecting the light from said arc, a hollow bar secured to said casing, a screen having a support adjustable in said bar, a lens arranged to project an image trodes on said screen,

of said arc-and elecand a support for said means forA prof lens adjustable on said bar, for the purpose set forth.

l0.' In apparatus of the character set forth, the combination With a lamp house and projecting mechanism associated there-- j With, of illuminating means Within the lamp house, said house having an opening inone. side, and means for opening a. picture of the illuminating means. In testimony whereof I aliix my signature in presence of two Witnesses.

SYDNEY JULIAN JACOBSON. Witnesses:

J. H. BRUNINGA, ARTHUR L. BRYANT.

`Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

projecting from said 

